Door-latch unit



Sept. 16, 1930. F. o. canuun 1,775818 um Aug. 2s. 1929 Patented Sept. 16, 1930 NITEfi STAT'ES PATENT FFICE FLETCHER D. GRUND, OF WESTON', OIIIO, ASSIQNOR T0 AMERICAN SWISS COM- IPANY, OF TOLEDO, OHIO, ACOBIORATIOIN' OF OHIO DOOR-LA'ICH UNI! Application filed August 23; 1929. Seria1 1 I0. 388,0Q41.-

This invention relates to door latches cf the type particularly adapted for use 011 vehicle bodies having inside and outside handles for retracting the latch bolt and also provided with dogging means for rendering 1ng mechanism.

Other object-s 01 the invention are to provide a simple and eflicient door latch having the new and improved features of construction, arrangement, and operation hereinafter des'cribed.

The inventlon is shown by way 0I" illustration in the accompanying drawings, in

which Figure 1 is a side elevation of the door latch, a ortion of the inside bolt-retracting mechanis1n being broken away; and Fig. 2 is an edge V1W of the parts shown in Fig. 1.

Tl1e illustrated embodiment 013 Ehe invcntion comprises a door latch having a back plate 1 provided with an outwardly extcnding flange 2 having an opening through Which projects the head 3 of the latch holt Integral with thc flange 2 is an extcnsion 1 in parallel relationship With the back plate 1 7 T he extension 4 provides a guide for the b0l1' head 3 and produces a more co1npact am] sturdy construction than where in previous constructions Ehe flange is continued at substantially right angles to the back plate 1.

Secured by rivets 5 to the holt head 3 is the holt 6 which is normally held in latching position by a coil spring 7 bcaring against a lug 8 011 the bolt.

The latch bolt is retractable fron1 tl1e ontside of the door in a Well .known 1nanuer by a roll-back 8 Which is normally disposed in a notch 9 formed in the bolt 6. The rollback unit is secured 150 the back plate by a cover plate 10 which engages an embossed portion 11 on the back plate. Integral with eration.

the roll-back 8 ls a do%gging extcnslon 12 having a nctch 13 to 1eceive a dog 14.

The dog 14 is piv ofed to a pin 14 011 the embossed part 11 of alle back plate and is for1ned with a finge1 15 which projects inco the space bctween the latch holt 6 and thc back plate l. lt will be observcd that a portion 16 of the latch bolt is engageable with the back plate 1 and the forward portion thereof is spaced fro1n the back platc.

The latch bolt.6 is retracted from the inside 0f the doof by a sultable control loycr 1 connected to a longitudinally disposed strap 17 which ihas an elongat'e slot 18 in onc cnd portion to Which the holt is connected by a pin 19. This provides a lost motion coni1cc- Ycion between the strap anal holt so that the dobr may be slammed, causing retracion of the latch holt without disturbing the inside retraCting mechanism, as Will be readily 1111- derstood.

v Formed in the latch holt 6 is an elongate opening 01 cut-ot 20, in this instance in che form of a longitudinally clongate slot, and. the inner end of the strap 17 normally extends slightly into thc region of this opcning. Ei tending outwardly at substantially right angles from the finger 15 of the dog is an extension 21 which in thc normal position ofthe arts bca1s against the end of the st1ap- 17, a coil spring 22 011 thc (log serving 1 0 hold the finger 15 in this posltion. A stop 23 constituting an end porti.on cf thc spring 22 is provided against which thedog 14- abuts when the strap. 17 is1n.oved 10 thc right ol1 Figure 1 t-o hold the extension 21 in position to be engaged by the strap 17 When the latter is moved away during bolt-ret-racting op- It Will be observed that norr'nally the rollback may be operated to retract the holt, the

' dog 14 being held out of 'dogging position.

which the finger 15 is swung to the left und,

the dog 14 engages in the notch 13 of the roll- 

